[SSHD-694] Provide README.md file(s) with useful code snippets
[SSHD-694] Provide README.md file(s) with useful code snippets

apache/mina-sshd,apache/mina-sshd,lgoldstein/mina-sshd,apache/mina-sshd,lgoldstein/mina-sshd,lgoldstein/mina-sshd,lgoldstein/mina-sshd,apache/mina-sshd